Deadly Strike. If the iron cobra surprises a creature and hits it with an
attack during the first round of combat, the target takes an extra 1d3
damage from the attack.

Limited Poison. The iron cobra's fangs has a limited poison capacity. Once it has
successfully made 3 poisonous bite attacks, it's poison supply will be empty and it's
bit attack will only do piercing damage.

ACTIONS
------------------------------------------------------------------------------------------Bite. Melee Weapon Attack: +3 to hit, reach 5ft., one target.
Hit: 4 (1d3+2) piercing damage, and the target must make a DC 12
Constitution saving throw, taking 3 (1d6) poison damage on a failed save,
or half as much damage on a successful one.